Follow the lower radiator hose from the radiator up to the thermostat cover. Remove the electrical connector that is on the cover (to the radiator fan switch) and then remove the 2 bolts holding the cover to get to the thermostat.How to install thermostate:
CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

Note the radio security code and station presets.

Disconnect the negative battery cable.

Drain the engine coolant into a sealable container.

Remove the fasteners from the thermostat housing, then remove the thermostat.

To install:
See Figures 1, 2, 3 and 4Fig. 1: A thermostat can be tested by placing it in a suitable container filled with water, and heating the water with a hot plate while monitoring the temperature with a thermometerFig. 2: The thermostat should open when the water reaches the correct temperatureFig. 3: The coolant bleed screw is located near the thermostat housing on Odysseys with 4-Hello! Where is the thermostat - 0900c152800b0b88.jpgan>
Fig. 4: Always install the thermostat with the small pin at the top. The rubber thermostat seal is installed around the thermostat

Install the thermostat using a new seal. If the thermostat has a small bleed hole, make sure the bleed hole is on the top.

Apply an anti-seize compound to the threads of the fasteners.

Reassemble in the reverse order of disassembly.

Set the heater to the full hot position. Set the heater to the full hot position.

On Odyssey models with 4-cylinder engines, locate the coolant bleed valve near the thermostat housing and open the valve 1/2 turn.

Top off the cooling system and overflow reservoir with a 50/50 mixture of a recommended antifreeze and water solution, and bleed the system to remove any air pockets as necessary. Simultaneously squeeze the upper and lower radiator hoses to help push any captured air pockets out of the system.

Inspect all coolant hoses and fittings to make sure they are properly installed and if previously opened, close the bleed valve.

Connect the negative battery cable.

Install the radiator cap loosely and start the engine. Allow the engine to run until the cooling fan has cycled two times, then turn the engine OFF and top off the cooling system as necessary.

Install the radiator cap and inspect for leaks.

Enter the radio security code.

WARNING
The manufacturer does not recommend using a coolant concentration of greater than 60% antifreeze.
When mixing a 50/50 solution of antifreeze and water, using distilled water may help to keep the cooling system from building up mineral deposits and internal blockage.

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The termostat is easy to locate and replace on any car. What you need to do is look for the TOP radiator hose and follow it back to the engine block. Where it ends you will see this hose clamped to an inlet pipe which is bolted to the engine's intake manifold. Remove the two bolts that hold this inlet pipe in place and there you will find the thermostat. Ypu can buy a repalcement thermostat at any auto parts store. To install the new thermostat, simply do the reverse procesure described above. a new thermostat will cost about $5.Please remember to rate my solution. Thanks!

You may have air in the system. Run the car with the cap removed and the defrosters on allowing air to escape. Add antifreeze as needed to keep full while running. Fluid level will drop as thermostat opens.

Honda recommends that the cooling system be topped up with coolant four times as part of the refill process. When the engine is fully cold open the radiator cap and add coolant until full. Run the car until fully warm with heater at maximum. Let it completely cool down. Remove radiator cap and top up with coolant. Repeat this process two more times. This helps purge the air out of the nooks and crannies in the cooling system.